You know, I think it's all about what your comfortable with. If you follow the instructions with vbPortal you will have no problems. I've probably installed it for people about 50 times and no problems.
I can see where it would be a little tricky, but the way it's layed out and they way it lets you add things so easily. I can't see where it could be beat.
Of course, I haven't used the others at al, so what do I know?
Josh